Blocker synchronizer



oct. 25, 193s. S o, WHIT Y 2,134,384

BLOCKER SYNCHRONIZER y Filed Sept. 25, 1936 Patented Oct. 235, 1938 UNITED STATES PATENT OFFICE samuel o. white, Muncie, Ind., assigner to no". 1 Warner Corporation, Chicago, Ill., a corporation of Illinois Application september z5, 193s, serial m102516- 1 0mm. (ci. 19H3) vlV through a slot in theblocker. In another" em.,

bodiment, blockerson opposite faces of the clutch hub or ring are connected to the latter by a clip engaged with the blockers as by friction.

It is a principal object of the'present invention "l5 to improve the mounting of the blocker with a view to substantially permanently uniting the A blocker with its supporting member.r Y t It is a further object of the inventlonto provide for the expeditious and secure attachment of a synchronizing blocker to a support therefor. Another object lresides in the provisionk of a.

blockermountingwhich will not get out of adjustment yet permitv easydisassembly at will.

Further objects and advantages of the invention will appear as` the description proceeds.

The invention will be best understood by reference to the following description of an .embodi-l ment thereof, shownin the accompanying drawing, wherein:

Fig. 1 is a longitudinal view, partly in section and partly in elevation, of a transmission mechl anism embodying the invention, taken substantially as indicated by the line I--I in Fig. 2.

Fig. 2 is a fragmentary view, partly in section and partly in elevation, taken substantially as indicated by the line II-lI in Fig. 1.

Fig. 3 is a fragmentary view takenas indicated by the line III- 111 in Fig. 1.

Fig. 4 is an enlarged fragmentary sectional view showing details of the invention.

Referring now particularly to the drawing, in which is illustrated a portion of a transmission such as may be found in automotive vehicles, in conjunction with marine engines, in stationary installations, and in fact in any assembly for the transmission of power, there is shown a drive shaft I and a driven gear 5 receiving torque from the drive shaft through gears including countershaft gearing (not shown) or other means, the

gear 5 being journaled on a bushing 5 about a driven shaft 1 journaled at 8 in the drive shaft 4. Splined at 9 to the driven shaft l intermediate the drive shaft l and the gear 5 is a clutch hub i0 arranged to have slight longitudinal floating movement relative to the driven shaft 1. Slidf vably splined on the'peripheral teeth I I of the hub Il, is a clutch collar I2 whose teeth Il are adapted to be matched with clutch teeth I4 on the `drive shaft-'to' establish a driving connection between .the drive shaft and the driven shaft through the 5 hub Il, or with clutch teeth .Ii'carried by the gear i to establish a reducedspeed driving connection through the hub. in between the drive `shaft and tliedrivenyshaft.k suitably mounted in relation to the frame is 10 'a shift forliy adapted to be yieldably held in the neutral position shown andinjeither of its two operating positions and received in an appropri-` v ate groove in the 'clutch collar for shifting the same. 15

Rotatably ceieseped Wahine 1mb` n 1s a mockler'l, the mounting'of which constitutes the salient feature of` the .present invention. I have chosen, for purposes of illustration only, the synchronlzer and blocker features` disclosed in detail 20 in said Orr application and `will referto them here miem. n y

'I'he blocker It may be provided with one or more blocking ,lugs i1, each adapted for limited rotary Vmovement between the wais of a slot or g5 notch i8 formedfin the hub I0. 'I'he collar I2 isalso-slotted at i9, providing tapered walls 20 for engagement with similarly formedwalls `|10, on each V(lug il. Securely attached to the blocker is a'friction 'ring 2| forsynchronizing engagement 30 with the friction cone surface 22 associated with the gear I. The collar I2 is-provided with a groove 23 adapted to freely receive the lug l1.

When the drive between the gear 5 and shaft 1 is to be established, the collar l2 is moved to the 35 right as seenin Fig. l, carrying the hub'i and y blocker I6 therewith as a unit until the friction surfaces are engaged, whereupon, due'to relative rotation between the shaft y1 and gear 5, the blocker is rotated relative to the hub'to one limit o of its movement, where its lug I1 obstructs the collar I2, by engaging one'of the tapered sur-y faces 20. Continued pressure from the collar I2 increases the synchronizing pressure, bringing the blocker and gear 5 into substantial synchro- 5k nism. Immediately following the establishment of synchronism, non-synchronism occurs. causing drift ofthe blocker relative to the hub I0 in a direction opposite to the original direction of its relative movement, bringing the lug il into 50 register with the groove 23 in the collar i2 so that the latter may' continue its movement to theright and clutch the teeth I5 on the gear 5.

From the foregoing, it will be readily understood how the blocker operates when the shift is g being made to second. It will also be understood how a blocker mounted on the left side of the collar I 0 would operate in the establishment of synchronized high speed.

In order to return the blocker axially with the hub I0 when the latter is returned to neutral position, to prevent accidental drag oi the blocker against the cooperating friction surface, retracting means is provided. In accordance with the present invention, the hub i0 has anaxial extension 24 which is outwardly flanged at 2l t0 provide an outwardly opening circumferential groove 26. The blocker has an inwardly extending iiange 21 whose inner periphery 28 is such as to telescopioally clear the extension ange so that the blocker ange may be located with a wall 29 thereof adapted to engage the hub wall 30 forming a continuation of a wall of the groove.

The'thickness of the blocker flange 21'i's sub-- stantially less than the width of the groove, and this difference affords a space for the reception of a split snap retainer or ring 3i. This retainer is adapted to be resiliently expanded so as to telescopically snap by the extension fiange25 id into the groove into which it contracts. When inthe slot or `slots in the hub i0, the slot holding each lug, and thereforev the blocker, in proper cooperative relation to the hub while the snap ring is being applied.

To facilitate this assembly, it will be observed, that the snap ring ends 22 are tapered at 33 awav from the bottom peripheryof the groove 26 to provide easily gripped or accessible portions which materially facilitate manual spreading or prying of said ends to springthering sumciently to retremely simple, inexpensive. expedient, efficient and durable mounting which will not get out oi' order, and which may be readily disassembled for repair or replacement, should the occasion require.

I am aware that many changes may be made and numerous details of construction may be varied through a wide range without departing from the principles of this invention, and I therefore do not purpose limiting the patent granted hereon otherwise than necessitated by the prior I claim as my invention:

In a transmission synchronizer of the character described., a first power transmission member mounted for rotation about a xed axis, a second power transmission member coaxial with said first member, each of said power members having radially extending toothed portions, the toothed portion of one member adapted for end to end alignment with the toothed portion of the other member, an'axially movable positive clutch member adapted to bridge and to engage the toothed portions of said power members, thereby to provide a direct two-way driving connection between the members, said irstpower member having a recess in that end wall facing said second power member, a blocker and synchronizer ring having a part disposed between thetoothed portions of said power members and adapted at times to engage with and retard axial movement of said positive clutch member, said blocker and synchronizer ring having a relatively narrow flange portion extending within said recess and laterally offset relative to said ring part in the direction of said first power member, and a locking ring engageable with said first power member and adapted to abut said last. named ange portion of said blocker and synchronizer ring,there by to restrain said blocker and synchronizer ring from axial movement relative to said first power member, said 'locking ring and said flanged portion being disposed entirely within said recess, therebyv to minimize the distance between said power members, said blocker and synchronizer ringy and said second power member having cooperating frictlon surfaces adapted when engaged to bring said members toa common speed;

O., WHITE. 

